Visual aid is the assistance by an instructional device used to appeal to the vision. A chart representing the effects of chemicals is the most effective aid.
<h3>What is a multimedia presentation?</h3>
A multimedia presentation is the representation of ideas, thoughts, and topics in a visually appealing format. It can be used to depict the effects on lives.
The chart depicting the harmful effects of the chemical-based standard farming with organic farming best explains the visual aid.
Therefore, option B. chart representing harmful effects of chemicals is the most effective visual aid.
Learn more about visual aid here:
brainly.com/question/4409123
